It was "not tenable" to have different standards for the same qualification, he said.

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Labour leader Eamon Gilmore said it was "simply not tenable" for Mr Cowen to remain PM.

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But a number of influential countries argue that increased spending is not tenable and they want a real freeze in the size of the budget.

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Looking forward fifty or a hundred years, irrespective of the amount of supply available, it is pretty clear from an environmental perspective that unconstrained fossil fuel use is just not tenable.

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But it is not a tenable position to say that the tax cuts for the wealthy should be made permanent.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

Certainly not a tenable position for most enterprise IT shops.

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The two sad years of 1930 and 1931 should be evidence enough to convince anyone that the alternative of encouraging positive voluntary action is simply not a tenable solution to a very real problem.

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Kennel Club spokeswoman Caroline Kisko told the BBC it was not "a tenable position" for the broadcaster to show Crufts - a programme "celebrating dogs" - when it had also aired a documentary "which was clearly so heavily biased against dogs".

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I'm trying to reconcile those two, not just the rhetoric, but how is it tenable to see a Libya where he would remain in power?

WHITEHOUSE: Press Briefing